Most of the time, you want to edit the source code via your favorite IDE. In this case, I want to do with vim. Let's see how to do it.
Reference:
* open_or_split.sh - https://gist.github.com/haxpor/351fa1...
Unity parameters:
-- /your/dir/open_or_split.sh unity $(File)
Godot parameters:
-- /your/dir/open_or_split.sh godot {file}